StmEng_SPH

Calculates the vapor specific entropy as a function of pressure and enthalpy—all variables expressed in English units. Use for both superheated and wet steam.

Format

StmEng_SPH(P, H)

Arguments

• P

  Pressure of the steam in psia. The valid range is 0.08865 to 14503.77 psia.

• H

  Computed vapor specific enthalpy in BTU/lbm. The valid range is -1.0 to 1860 BTU/lbm.

Returns

Computed vapor specific entropy in BTU/lbm/R or- Error digital state.

Sample Values

Note: Even if the input enthalpy is less than that of the saturated liquid, the function still computes the entropy by extrapolation without setting an error state.